# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Prepare CHiME3 background data.

Download, unpack and create manifest files.
Manifest file is a json-format file with each line containing the
meta data (i.e. audio filepath, transcript and audio duration)
of each audio file in the data set.
"""
import argparse
import io
import json
import os
import zipfile

import soundfile
import wget
from paddle.v2.dataset.common import md5file

# DATA_HOME = os.path.expanduser('~/.cache/paddle/dataset/speech')
DATA_HOME = os.path.expanduser('.')

URL = "https://d4s.myairbridge.com/packagev2/AG0Y3DNBE5IWRRTV/?dlid=W19XG7T0NNHB027139H0EQ"
MD5 = "c3ff512618d7a67d4f85566ea1bc39ec"

parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
    "--target_dir",
    default=DATA_HOME + "/chime3_background",
    type=str,
    help="Directory to save the dataset. (default: %(default)s)")
parser.add_argument(
    "--manifest_filepath",
    default="manifest.chime3.background",
    type=str,
    help="Filepath for output manifests. (default: %(default)s)")
args = parser.parse_args()


def download(url, md5sum, target_dir, filename=None):
    """Download file from url to target_dir, and check md5sum."""
    if filename is None:
        filename = url.split("/")[-1]
    if not os.path.exists(target_dir):
        os.makedirs(target_dir)
    filepath = os.path.join(target_dir, filename)
    if not (os.path.exists(filepath) and md5file(filepath) == md5sum):
        print("Downloading %s ..." % url)
        wget.download(url, target_dir)
        print("\nMD5 Checksum %s ..." % filepath)
        if not md5file(filepath) == md5sum:
            raise RuntimeError("MD5 checksum failed.")
    else:
        print("File exists, skip downloading. (%s)" % filepath)
    return filepath


def unpack(filepath, target_dir):
    """Unpack the file to the target_dir."""
    print("Unpacking %s ..." % filepath)
    if filepath.endswith('.zip'):
        zip = zipfile.ZipFile(filepath, 'r')
        zip.extractall(target_dir)
        zip.close()
    elif filepath.endswith('.tar') or filepath.endswith('.tar.gz'):
        tar = zipfile.open(filepath)
        tar.extractall(target_dir)
        tar.close()
    else:
        raise ValueError("File format is not supported for unpacking.")


def create_manifest(data_dir, manifest_path):
    """Create a manifest json file summarizing the data set, with each line
    containing the meta data (i.e. audio filepath, transcription text, audio
    duration) of each audio file within the data set.
    """
    print("Creating manifest %s ..." % manifest_path)
    json_lines = []
    for subfolder, _, filelist in sorted(os.walk(data_dir)):
        for filename in filelist:
            if filename.endswith('.wav'):
                filepath = os.path.join(data_dir, subfolder, filename)
                audio_data, samplerate = soundfile.read(filepath)
                duration = float(len(audio_data)) / samplerate
                json_lines.append(
                    json.dumps(
                        {
                            'utt': os.path.splitext(os.path.basename(filepath))[
                                0],
                            'feat': filepath,
                            'feat_shape': (duration, ),  # second
                            'type': 'background'
                        }))
    with io.open(manifest_path, mode='w', encoding='utf8') as out_file:
        for line in json_lines:
            out_file.write(line + '\n')


def prepare_chime3(url, md5sum, target_dir, manifest_path):
    """Download, unpack and create summary manifest file."""
    if not os.path.exists(os.path.join(target_dir, "CHiME3")):
        # download
        filepath = download(url, md5sum, target_dir,
                            "myairbridge-AG0Y3DNBE5IWRRTV.zip")
        # unpack
        unpack(filepath, target_dir)
        unpack(
            os.path.join(target_dir, 'CHiME3_background_bus.zip'), target_dir)
        unpack(
            os.path.join(target_dir, 'CHiME3_background_caf.zip'), target_dir)
        unpack(
            os.path.join(target_dir, 'CHiME3_background_ped.zip'), target_dir)
        unpack(
            os.path.join(target_dir, 'CHiME3_background_str.zip'), target_dir)
    else:
        print("Skip downloading and unpacking. Data already exists in %s." %
              target_dir)
    # create manifest json file
    create_manifest(target_dir, manifest_path)


def main():
    prepare_chime3(
        url=URL,
        md5sum=MD5,
        target_dir=args.target_dir,
        manifest_path=args.manifest_filepath)


if __name__ == '__main__':
    main()
